In 2005, the U.S. executive responsibility workplace suggested that every one firms commence making plans a coherent transition to IPv6. IPv6 will clear up the matter of restricted IP addresses and enhance internetworking services. This promising protocol is gaining momentum and it is just an issue of time prior to the transition should take place globally. the matter is that in the three-to-six 12 months transition interval, IPv6 and its predecessor, IPv4, must effectively coexist so as to be sure carrier continuity. not just federal firms, yet agencies and associations needs to commence making plans the transition to IPv6 now to keep up the operation, safeguard, and interoperability in their networks. The implementation of IPv6 is key to the ongoing development of the net and the advance of recent purposes. The Handbook of IPv4 to IPv6 Transition Methodologies presents a wealth of most sensible practices and techniques that may support firms plan and enforce a gentle transition to IPv6.

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Extra resources for Handbook of IPv4 to IPv6 Transition: Methodologies for Institutional and Corporate Networks

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001 Format. Preﬁx 16 bits Site Topology 24 bits 8 bits Public Topology 13 bits 16 bits 48 bits IPv6 Addressing n 31 10/31/07 10:03:36 AM 32 n Handbook of IPv4 to IPv6 Transition ID comprises the next 13 bits; the next 8 bits are reserved; and the next 24 bits represent the next-level aggregator (NLA) ID. This combination gives the first two levels. The next 16 bits represent the site topology, namely, the site-level aggregator (SLA) ID. The SLA is used by a firm or organization to identify subnets within its site (intranet); the organization can use the 16 bits within its site to create 65,536 subnets or multiple levels of addressing hierarchy, which can also facilitate the routing process.

This gives rise to a number of complexities in the migration process between the IPv4 and the IPv6 environments. However, techniques have been developed to handle these migrations, as we discuss later in the book. 3 IPv6 Base Header IPv6 Header Field Length (bits) Function Version 4 Identifies the version of the protocol. For IPv6, the version is 6. Traffic Class 8 Intended for originating nodes and forwarding routers to identify and distinguish between different classes or priorities of IPv6 packets.

This field identifies packets that require special handling by the IPv6 node. The following list shows the ways the field is handled if a host or router does not support flow label field functions: • If the packet is being sent, the field is set to zero. • If the packet is being received, the field is ignored. Payload Length Next Header 16 8 Identifies the length, in octets, of the payload. This field is a 16-bit unsigned integer. The payload includes the optional extension headers as well as the upper-layer protocols, for example, TCP.